Baseband Troubleshooting; Rh-3 Baseband Module Overview - Nokia RH-3 Series Troubleshooting - Bb

CCS Technical Documentation

Baseband Troubleshooting

RH-3 Baseband Module Overview

The Baseband module of the RH-3 transceiver is a CDMA dual-band engine. The base-
band architecture is based on the other CDMA DCT4 phones, including NHP-2 and
NPD-1, with a few modifications to support the RH-3 specific features (the new Path-
finder RF and GPS, which is reused from the NPD-4 program).
RH-3 cellular baseband consists of three ASICs: Universal Energy Management (UEM),
Universal Phone Processor (UPP), and FLASH 64Megabit. There is a fourth BB ASIC imple-
menting the GPS receiver in the phone.
The baseband architecture supports a power-saving function called sleep mode. This
sleep mode shuts off the VCTCXO, which is used as system clock source for both RF and
baseband. During the sleep mode, the system runs from a 32 kHz crystal and all the RF
regulators (VR1A, VR1B, VR2, ... VR7) are off. The sleep time is determined by network
parameters. Sleep mode is entered when both the MCU and the DSP are in standby mode
and the normal VCTCXO clock is switched off. The phone is waken up by a timer running
from this 32 kHz clock supply. The period of the sleep/wake up cycle (slotted cycle) is
1.28N seconds, where N= 0, 1, 2, depending on the slot cycle index.
RH-3 supports standard Nokia 2-wire and 3-wire chargers (ACP-x and LCH-x). However,
the 3-wire chargers are treated as 2-wire chargers. The PWM control signal for control-
ling the three-wire charger is ignored. UEM ASIC and EM SW control charging.
BL-5C Li-ion battery is used as main power source for RH-3. BL-5C belongs to the new
family of Lynx batteries. One of the biggest differences between the Lynx and the older
batteries is that the temperature sensor for the battery has been removed from the bat-
terypck and is placed in the phone. BL-5C has nominal capacity of 850 mAh.
RH-3 supports Tomahawk accessories. The system connector for the RH-3 phones is
14-pin Tomahawk connector. The accessories supported include headset (HDB-4), loopset
(LPS-4), HF Basic Car Kit (BHF-1), advanced Car Kit (CarK-126), data cable (DKU-5), and
the data/Flash cable (DKU-5F). The detection is based on the digital ID read from the
accessories. For detail information, please refer HDca2 BB module specification
(DHX01477-EN).
Issue 1 06/2003
Nokia Corporation
Troubleshooting — BB
Confidential
RH-3
Page 5